Arduino Based Cellular Sensor Sentinel
Expanding the capabilities of your Arduino is easily done by adding a shield. Plugging directly into an Arduino and typically including custom libraries for easy coding, sheilds provide a quick way to expand a project. In his Weekend Project: Cellular Sensor Sentinel, Adam Wolf uses a Seeed Studio GPRS/GSM Shield to send text messages when sensors are tripped.
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MAKE Magazine and Instructables.com's Blog
MAKE Magazine and Instructables.com isn't a Goodreads Author
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